Missing US teen's parked car is the only clue following her disappearance

Nevada teen Madelyn Lingenfelter, 19, has been missing for one week and the only clue is her parked car.

Lingenfelter was last seen at her home last Wednesday morning, September 19. Her car, a 2004 Toyota Prius, was found outside an event centre two days after her disappearance.

The manager of the event centre said they saw someone, believed to be Lingenfelter, in the passenger seat of the car at around 4pm that Wednesday September 19. They came back to see the car empty a few hours later. Police haven't found anything in the car that would assist with the investigation.

After an extensive search operation in the Mt. Rose area spanning nearly 500 kilometres (300 miles), authorities have called off the search.

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Police admit they're stumped for answers.

"We don't have a single clue. We're at that point where we don't know where else to go," a spokesperson for the Washoe County Sheriff's Office, Bob Harmon, told the Reno Gazette.

"I hope she's out there somewhere, and can let us know. A lot of people are concerned for her."

Family and friends insist Lingenfelter isn't an "outdoor type of person" who would wander into the woods.